thumb|260px|The Common Linnets in 2016|alt=Ilse DeLange in 2016 (with German band The BossHoss) The Common Linnets are a Dutch band that was formed in 2013. The band originally consisted of Ilse DeLa
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x567c4aeecab3b1f352331771e94f1a8c1eafa2f7006fb15a394549a9fff4b51f. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3e1dd919-55b9-4221-afc8-31b1e1134823.json and https://artists.proofprofile.net/proofs/artist/3e1dd919-55b9-4221-afc8-31b1e1134823.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5556ba9d4be377829140c804a5d7989004405066acd0b69e2ee89f4dbbceb6da. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLUV71400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe203c84a0ba124bbf6e7b79cfa8f4e9d84f61de79b313bcf1dceeb97ed4e10c9. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLUM71400156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c2d93fa3d14cd8f3aa847e33364bd630a8d1234a2dbb6934bab5fbdd46dd14. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLUM71400158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3100effabac6b68dff35081c4b840eb575910145fdd01451a7681b653a720d35. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLUM71400148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe122de5f6112b733dd84b9d060fba70b7114abe85804aa0bde240ddf934ca64c. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLUM71400460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe942893c6f16d4eb5a9d71fddcf4ef02c10a86ed9c902d3befd68e4771a6f984. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLUM71400353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ef1b77ca77f299c6cd2efaa03a8c7948b01a154d81067a5d225be604b9c3cf. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLUM71400159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0728727df558f25717830582e9243d1b4c5e2292355a0cd53db4998314fd0bc3. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLUM71400147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe122de5f6112b733dd84b9d060fba70b7114abe85804aa0bde240ddf934ca64c. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLUM71400460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5828a9226c65576117bd1c1e57ed36cbe5334e8f0b475b0364887629c0bfcb94. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLUM71500140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2657a59d931e25f6a3cc1dc778394f4cd0a9d432326e756508b0c52076ab1a27. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLUM71500142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36efd837f213dd1f464a8d9c6c38b7571edd13af656d9d519eff11560f3e9894. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLUM71500146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9440cf95015c28bc2984d5c8c1b0817261913f4d003d8bf2f3517dfc50638ab. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLUM71500144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe6a35f2b27033608b8d850552f6f588fc06f919ccf2380eba2bddea83a4269. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLUM71500147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496b0218335d2b0b199b05f0224d9d6b8048198e07bc202f0161504c29348bdc. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLUM71500139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfa292b071a3349d2bd21ab435ee62a331b59dd8af96988adb161edcc35aa073. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEUM71502969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a61fd3481236c83126a4270e25f18e5affc0e4322790d3ffb12f005547b3be2. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLUM71500138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0728727df558f25717830582e9243d1b4c5e2292355a0cd53db4998314fd0bc3. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLUM71400147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c81f428cd0cdf27aa8cddbc176517ea4f99d98625efa9c49d8487acccc5fad. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLUM71400352.